Thinking about it, Pinkie Pie is the only one that Pinkie bank hasn't tried to get money from (or perhaps she just spends all her money on party supplies so she's left alone)

Though I think I've figured out where everypony goes wrong in terms of handling Pinkie Bank; they always chase her or try to trick her. Aggression obviously doesn't work, so maybe giving her a very firm hug would work better to reclaim your coins (instead of regular squeezing, using fun squeezing)

Man im surprised that pinkie bank hasn't gotten really big or broken into pieces after taking all that money and gems (you think at least she would get sick after eating all them money) also twilight must be really blind not to see that pinkie bank under her